The Girl I saw in Metro

I am a clinic plus shampoo sales person. I saw a girl wearing red sweater in the metro , I was standing behind sir , she was weirdly smiling , I could see her smiling into the mirror lol. I was looking at her hair , cause there was lot of dandruff so I can sell her my shampoo , I was about to ask her but she again started smiling so I turned my head right away.